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B-Tree vs Hash Table
...and thus are default.
However if you have a very precise use case and you know exactly what and only what is going to be needed, you can take advantage of hashing indexes.
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What are the differences between the BLOB and TEXT datatypes in MySQL?
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TEXT is going to be replaced with Varchar(MAX) but for now depending on your version of mysql use TEXT for large text posts such as blog body posts etc. BLOB shouldn't be used for storing very long URL addresses or large amounts of text. It's normally used to store images or othe...
When to use the JavaScript MIME type application/javascript instead of text/javascript?
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@Pacerier - I know this comment is 5 years old, but today it is often best to include mime types, particularly for forum type websites, for security reasons. Having the receiver interpret the type leaves one open to attack by uploading a ma...
Use of 'const' for function parameters
...mation. You provide the parameter by value so the caller does not need to know anything on what you do (internally) with it. So write class Foo { int multiply(int a, int b) const; } in your header. In your implementation you do care that you can promise not to alter a and b so int Foo::multiply(cons...
What is causing ERROR: there is no unique constraint matching given keys for referenced table?
...atching given keys for referenced table, and having stared at it for while now I can't figure out why this error arises in this situation.
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Update Item to Revision vs Revert to Revision
...ected revision (in your example rev. 96,97,98,99,100)
Your working copy is now in modified state.
The file content of both scenarions is same, however in first case you have an unmodified working copy and you cannot commit your changes(as your workingcopy is not pointing to HEAD rev 100) in second...
Using do block vs braces {}
...ctures (if, while, case, etc.)
The second, less-frequently seen style is known as semantic, or "Weirich Braces", proposed by the late, great rubyist Jim Weirich:
Use do end for procedural blocks
Use braces { } for functional blocks
This means that when the block is evaluated for its return valu...
Find XOR of all numbers in a given range
...bits cycle every 4. So, that's how to arrive at that little lookup table.
Now, consider for a general range of [a,b]. We can use f() to find the XOR for [0,a-1] and [0,b]. Since any value XOR'd with itself is zero, the f(a-1) just cancels out all the values in the XOR run less than a, leaving you w...
How to get string objects instead of Unicode from JSON?
...e a conversion function:
I used the one from Mark Amery a couple of times now, it works great and is very easy to use. You can also use a similar function as an object_hook instead, as it might gain you a performance boost on big files. See the slightly more involved answer from Mirec Miskuf for th...
API Keys vs HTTP Authentication vs OAuth in a RESTful API
... @TomDoe Hi Tom - Yes that makes sense. You probably want to use OAuth2 now. If your server is in Python (Django or Flask) take a look at github.com/omab/python-social-auth
– Sid
Aug 18 '15 at 19:43
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